HVAC Ductwork Question

I am finishing my basement and need to put 3 new air outlets from my
ductwork on the basement ceiling to the new rooms below.
#1 will be from a rectangular duct - no problem - cut a hole and put in an
outlet.
#2 and #3 have to come from round ducts - I have no idea how to do it. I am
planning to go to Home Depot and ask advice this weekend but sometimes don't
get straight answers there. Go figure! LOL
Any advice? Thanks!

No...Don't know what that is. I have pulled permits on the entire
job...building, plumbing,
electrical and mechanical. Would this be a code thing that the inspector
might help with? I was hoping not to hire a contractor.

The Manuals compute the what ducts are needed, the A/C capacity needed
and the heating capacity needed for your specific home based on many
factors. If this is not done, any conclusions are just guesses. Proper
sizing had a great deal to do with how well and efficiently a system will
work.
Adding new ducts and loads to an existing system can screw it up.
Any good professional will go to the trouble of doing these calculations
before doing such a job. Anyone that does not is just a hack and you may
end up redoing the job or suffering poor performance.

Thanks everyone for your input. I went to Home Depot and found that I just
needed to cut holes in the round ducts and put on "saddles" . However, I am
going to have a pro come and check out the system to see if it will hancdle
the capacity. Not sure what I will do if it won't though.

I dug out anf finished a 600 sq ft basement and found out in summer all
I needed was a return, But my AC cooled the basement to 65 from
uninsulated ducts, making it cold. So I insulated the ducts now it is
warmer in summer but colder in winter so I added supplys, for winter.
Do it right the first time I learned the hard way. I had excess capacity
from my hvac, that should be your first question.

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